Question

what is the basic unit of structure and function of all living organisms?
○ mitochondrion
○ dna
○ nucleus
○ cell

Explanation:

• Mitochondrion: Organelle for energy, not basic unit.
• DNA: Genetic material, not structural/functional unit.
• Nucleus: Organelle, not the basic unit.
• Cell: Defined as the basic unit of structure/function in living organisms.

Answer:

D. cell (Note: Assuming the options are labeled A - D as per typical multiple - choice, with A: mitochondrion, B: DNA, C: nucleus, D: cell)